Sieves are of the finest manufacture and meet all specs. The frames are made of brass and are drawn from one piece without a seam. Extended bottoms (skirts) are also seamless and they are matched to fit all frames, pans or separator pans of the same diameter - for convenient stacking. The cloth is hand-soldered onto the frame, the frame skirt, then spun over the cloth, and the circle of contact between cloth and the frame is smoothly filled with solder so no material is lost between cloth and frame. Nameplate shows sieve number, microns and nominal openings (in both millimeters and inches).